▎ 摘　　要

NOVELTY - Producing functionalized graphene involves preparing graphite oxide by oxidative treatment of pure graphite; subjecting the graphite oxide to exfoliation; reducing exfoliated graphite oxide by using hydrazine hydrate to produce graphene; washing the obtained graphene with water and methanol; and drying the graphene. USE - For producing functionalized graphene useful for protecting metals from corrosion (claimed), in particularly as an adsorption type corrosion inhibitor for steel or other metals in corroding environment, such as acidic environment. ADVANTAGE - The process provides the functionalized graphene contains oxygen functionalities and nitrogen functionality specified as C/O and C/N in a ratio of 5:8 and 10:12 respectively. The process provides functionalized graphene based corrosion inhibitor which improves corrosion resistance of steel or metals with similar oxidation potentials. The process fully reduces graphite oxide by adding hydrazine hydrate which gave a poor dispersion in water. The functionalized graphene flakes are flat monolayer of carbon with very large surface area. When steel samples are kept in side acidic solution with functionalized graphene, due to presence of carbonyl and carboxylic functionalities in functionalized graphene these flakes get adsorbed by metal surface. Since graphene has a tendency to adsorbs hydrogen. It slows down hydrogen reduction reaction and effectively reduces hydrogen ion exchange current density. Hence, presence of graphene slows down rate of corrosion.